Mark Shegelski of the University of Northern British Columbia talks with podcast host Steve Mirsky about the physics of curling, currently taking its turn on the world stage at the Vancouver Olympics. (Shegelski is also the author of the new sci-fi collection "Remembering the Future.") Plus, we test your knowledge of some recent science in the news

Researchers writing in the journal Science discuss the threat to athletic integrity posed by genetic doping--gene therapy to enhance performance--as well as efforts to test for it. Cynthia Graber reports